Which of the following statements about the cells of the mucous membrane lining air tubes of humans is false?
A) They manufacture secretory products.
B) They are stratified squamous epithelial cells.
C) They are cuboidal or columnar in shape.
D) They have cilia that collect and transport mucus up and out of the respiratory system.
Answer: B
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Which of the following best describes the characteristics of the ascending arm of the loop of Henle? (Select all correct choices.)
A. It is permeable to water. B. It actively transports electrolytes. C. It is impermeable to water. D. Its filtrate is mainly urea. E. Its filtrate becomes more and more concentrated.
Which of these is not a type of water pollutant?
(a) dissolved oxygen. (b) toxic chemicals. (c) organic wastes. (d) sediment.
In spongy bone tissue, the spaces are filled with:
a. air b. blood c. cartilage d. red bone marrow e. lymph
In plants, which of the following cells is(are)
diploid? a. egg b. sperm c. spore d. leaf cell e. spore and leaf cell